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Olympic National Park bans drones amid US order

In this photograph taken Saturday, July 6, 2013, a couple walks down Shi Shi Beach in Washington state's Olympic National Park. One of the most pristine beaches in Washington state, Shi Shi provides blissful disconnect to hikers and campers at the beach. (AP Photo/Manuel Valdes)Show Caption

Each park must change its unique set of regulations for a ban to be enforceable.

In their rule change, Olympic National Park officials said drones present "unacceptable risks to visitors," including possible injuries from collisions or contact with spinning propellers or rotors. They also cited the potential impact on wildlife.

There have been no reports of drones annoying or imperiling visitors, Olympic National Park spokeswoman Barb Maynes said. But it's been a different story at other national parks.

In Yellowstone, which covers parts of Wyoming, Idaho and Montana, drones have crashed into lakes and springs and flown too close to bison. At least three visitors have been cited this summer.

At Yosemite in California, enthusiasts flew drones near the park's famous waterfalls to capture close-up shots of climbers on its granite cliffs. In Utah's Zion, officials were prompted to take action after a drone was seen harassing bighorn sheep and separating the young from their herds.

At Mount Rushmore in South Dakota, park rangers last September confiscated an unmanned aircraft after it flew above 1,500 visitors seated in an amphitheater and then over the heads of the four presidents carved into the mountain.

Some of the parks that have banned drones are Grand Canyon in Arizona; Zion, the Arches and Canyonlands in Utah; and Bandelier National Monument in New Mexico.